Bottomless Pits, Bed 9, Kaibab Formation, Walnut Canyon (Permian of the United States)

Where: Coconino County, Arizona (35.2° N, 111.6° W: paleocoordinates 9.2° N, 36.6° W)

• coordinate estimated from map

• local area-level geographic resolution

When: "Alpha" Member (Kaibab Formation), Roadian (272.3 - 268.8 Ma)

• Bed is 1 foot thick; forms weak ledge

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; dolomitic, shelly/skeletal, yellow, silty limestone

• Limestone: yellow, dolomitic, silty, very fossiliferous

Size class: macrofossils

Preservation: mold/impression

Primary reference: H. Chronic. 1952. Molluscan fauna from the Permian Kaibab Formation, Walnut Canyon, Arizona. Geological Society America Bulletin 63(2):95-166 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39999: authorized by David Bottjer, entered by Matthew Clapham on 13.06.2004, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Parallelodontidae
"Grammatodon politus" = Grammatodon (Cosmetodon) politus
"Grammatodon politus" = Grammatodon (Cosmetodon) politus Girty 1909 clam
 Myalinida - Myalinidae
? Myalinella adunca n. sp. Chronic 1952 clam
 Pectinida - Aviculopectinidae
Aviculopecten kaibabensis Newell 1938 scallop
 Pectinida - Limipectinidae
Acanthopecten coloradoensis Newberry 1861 scallop
 Ostreida - Bakevelliidae
Bakevellia prora n. sp. Chronic 1952 oyster
 Ostreida - Pterineidae
"? Dozierella "sp. 2"" = Leptodesma
"? Dozierella "sp. 2"" = Leptodesma Hall 1883 oyster
 Ostreida - Pinnidae
"Aviculopinna sagitta n. sp." = Meekopinna sagitta
"Aviculopinna sagitta n. sp." = Meekopinna sagitta Chronic 1952 oyster
 Mytilida - Mytilidae
Promytilus retusus n. sp. Chronic 1952 mussel
 Carditida - Astartidae
Astartella subquadrata Girty 1909 clam
 Cardiidia - Sanguinolitidae
Alula gilberti White 1883 clam
"Allorisma terminale" = Wilkingia terminale Hall 1852 clam
? Sanguinolites sp. M'Coy 1844 clam
 Cardiida - Kalenteridae
"Pleurophorus cf. mexicanus" = Permophorus mexicanus, "Pleurophorus albequus" = Permophorus albequus
"Pleurophorus cf. mexicanus" = Permophorus mexicanus Girty 1909 clam
"Pleurophorus albequus" = Permophorus albequus Beede 1907 clam
 Modiomorphida - Modiomorphidae
Goniophora cristata Chronic 1952 clam
 Pholadomyida - Edmondiidae
Edmondia sp. de Koninck 1841 clam
 Trigoniida - Schizodidae
Kaibabella curvilenata n. gen. Chronic 1952 clam
Schizodus texanus Clifton 1942 clam
 Protobranchia - Manzanellidae
Manzanella cryptodentata Chronic 1952 clam
 Protobranchia - Solemyidae
Solemya parallella Beede and Rogers 1899 Awning Clam
 Nuculida - Nuculidae
"Palaeonucula levatiformis" = Nuculavus levatiformis
"Palaeonucula levatiformis" = Nuculavus levatiformis Walcott 1884 nut clam
Gastropoda
  -
 Euomphalina - Euomphalidae
Euomphalidae "sp. juvenile" de Koninck 1881 snail
 Euomphalina - Microdomatidae
Glyptospira cristulata n. gen. Chronic 1952 snail
 Prosobranchia - Meekospiridae
? Girtyspira sp. Knight 1936 snail
Meekospira "sp. 1" Ulrich and Scofield 1897 snail
Meekospira "sp. 2" Ulrich and Scofield 1897 snail
 Prosobranchia - Goniasmatidae
? Goniasma sp. Tomlin 1930 snail
 Prosobranchia - Orthonematidae
? Orthonema "sp. 2" Meek and Worthen 1862 snail
? Orthonema striatonodosum Chronic 1952 snail
 Cerithimorpha - Orthonemidae
"Murchisonia geminocarinata" = Donaldospira geminocarinata
"Murchisonia geminocarinata" = Donaldospira geminocarinata Chronic 1952 snail
 Bellerophontida - Bellerophontidae
Bellerophon deflectus Chronic 1952 snail
 Murchisoniina - Gosseletinidae
? Mourlonia cancellata n. sp. Chronic 1952 snail
Glabrocingulum laeviliratum Chronic 1952 snail
? Glabrocingulum coronatum n. sp. Chronic 1952 snail
? Euconospira cryptolirata n. sp. Chronic 1952 snail
 Murchisoniina - Lophospiridae
? Worthenia sp. de Koninck 1883 snail
Worthenia corrugata Chronic 1952 snail
 Murchisoniina -
Murchisonioidea indet. Koken 1896 snail
Tergomya
 Archinacellida - Metoptomatidae
cf. Lepetopsis sp. Whitfield 1882
Scaphopoda
 Dentaliida - Prodentaliidae
"Plagioglypta canna" = Prodentalium canna
"Plagioglypta canna" = Prodentalium canna White 1874 tusk shell
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid